http://dspace.nbuv.gov.ua:80/handle/123456789/132731 2026-04-20T17:17:05Z http://dspace.nbuv.gov.ua:80/handle/123456789/136815 The plastic scintillator for n/γ-discrimination with alkyl-substituted PPO derivative. Zhmurin, P.N.; Eliseev, D.A.; Pereymak, V.N.; Svidlo, O.V.; Gurkalenko, Yu.A. A new polystyrene-based plastic scintillator for pulse shape n/γ-discrimination is obtained by using alkyl-substituted PPO derivative as scintillation dopant. The microhardness and FOM of the new PS is measured. The microhardness is equal to 39 MPa, and FOM on 2 MeVee level is equal 2.12. Also it is established, the new PS has high long-term stability. 2017-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/136812 The alternative approach to the preparation of complex calcium phosphates and their characterization Livitska, Ok.; Strutynska, N.; Livitska, Ol.; Slobodyanik, N. In this paper a new approach to the preparation of complex calcium-containing phosphates using molten chlorides and nitrates of alkaline metals as fluxes was described. The main advantages of used technique for synthesis of double phosphates comparing with traditional methods (solid state reactions or crystallization of a high temperature self-flux) were discussed. It was found that the phase composition of obtained crystalline products depends on type of salt melts, nature of alkaline metals and type of initial components. Formation conditions for compounds MICaPO₄, MI₂CaP₂O₇ (MI - Na, K), Ca₂P₂O₇, Ca₂PO₄Cl and Ca₁₀(PO₄)₆Cl₂ were established. The synthesized phosphates were characterized using powder X-ray diffraction, Fourier transform infrared spectroscopy and optical microscopy. 2017-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/136810 Nonlinear analysis of concrete-filled steel square tube strengthened by internal transverse stiffened bars under axial compression Nan Li; Lai Wang; Yajun Xi; Tong Guan; Hui Wang; Furui Dong A new type of concrete-filled square steel tubular(CFSST) column is proposed, which is characterized by the transverse stiffened steel bars arranged inside the pipe wall to improve confinement performance of the concrete core. This paper employs a nonlinear analysis of square CFSST stub columns under axial compression. A three-dimensional nonlinear finite element (FE) model is developed using ABAQUS, where nonlinear material behavior and enhanced strength corner properties of steel are included. Close agreement is achieved between the test and FE results in terms of load-deformation response and ultimate strength. 2017-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/136807 Kirchhoff and electron curvature indexes for SiC nanoclusters Luzanov, A.V. To characterize carborundum nanoclusters (nano-SiC) we employ the topological Kirchhoff index and average energy of molecular graphs. Additionally, electron-kinematic indexes which reflect an average curvature of electron paths in molecule, are invoked. The main polytypes, namely, 3C-SiC and 2pH-SiC, p = 1÷4, are investigated. It is established that the topological indexes make only a slight distinction between nano-SiC of the different polytypes. Quite the opposite, the electron curvature indexes provide a clear discrimination of the polytypes. In particular, the curvature indexes are ordered just in the same manner as the hexagonality measure known for such polytypes. For the electron curvatures, an effective algorithm is elaborated, allowing us to analyze nano-SiC with 10⁴ and more atoms even by using laptops. 2017-01-01T00:00:00Z